Turning to the names of her proposed sureties, we find among them five earls, of whom the Earls of Norfolk and of Pembroke invite special notice. The former had played a shifty part from the very beginning of the reign. He appears to have really fought for his own hand alone, and we find him, the year after this, joining the Earl of Essex in his wild outburst of revolt. With Pembroke the case was different. He had been among the nobles who, the Christmas before, had assembled at Stephen's court, and had attested the charter there granted to the Earl of Essex. He may, in the interval, have quarrelled with Stephen and joined the party of the Empress; but I think the occurrence of his name may be referred, with more probability, to another cause, that of his family ties. It is, indeed, to family ties that we must now turn our attention. The Earl of Essex had included, as we have seen, in his demands on this occasion, provisions in favour of certain of his relatives, including apparently his sisters' husbands. But these by no means exhausted the concessions he had resolved to exact. He had come prepared to offer the Empress the support, not only of himself, but of a powerful kinsman and ally. This was his wife's brother, Aubrey de Vere. It will be better to relegate to an appendix the relationship of these two families, without a clear understanding of which it is impossible to grasp Geoffrey's scheme, or to interpret aright these charters in their relation to one another, and in their bearing as parts of a connected whole. Unfortunately, the errors of past genealogists have rendered it a task of some difficulty to ascertain the correct pedigree.[563] When the fact has been established on a sure footing that Aubrey stood in the relation of wife's brother to Geoffrey, we may turn to the charter upon which my narrative is here founded. This is a charter of the Empress to Aubrey at Oxford. Mr. Eyton had, of course, devoted his attention to this, as to the other charters, in his special studies on the subject, but his fatal mistake in assigning both this and the above charter to Geoffrey to the year 1141 deprives his conclusions of all value. We may note, however, that he argued from the mention, in the charter granted to Geoffrey, of "Earl Aubrey," that it must, in any case, be subsequent to the charter by which Aubrey was created an earl. He, therefore, dated the latter as "_circ._ July, 1141," and the former "_circ._ August, 1141" (or "between July 25 and Aug. 15, 1141").[564] This reasoning could at once be disposed of by pointing out that the Empress accepted her new ally and supporter as "Earl Aubrey" already. Of this, however, more below. But the true answer is to be found in the fact, which Mr. Eyton failed to perceive, that these two charters were not only granted simultaneously, but formed the two complements of one connected whole. In the light of this discovery the whole episode is clear.